mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
205 lines
5.6 KiB
205 lines
5.6 KiB
.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later |
|
|
|
======== |
|
Glossary |
|
======== |
|
|
|
.. note:: |
|
|
|
The goal of this section is to standardize the terms used within the media |
|
userspace API documentation. This is Work In Progress. |
|
|
|
.. Please keep the glossary entries in alphabetical order |
|
|
|
.. glossary:: |
|
|
|
Bridge Driver |
|
A :term:`Device Driver` that implements the main logic to talk with |
|
media hardware. |
|
|
|
CEC API |
|
**Consumer Electronics Control API** |
|
|
|
An API designed to receive and transmit data via an HDMI |
|
CEC interface. |
|
|
|
See :ref:`cec`. |
|
|
|
Device Driver |
|
Part of the Linux Kernel that implements support for a hardware |
|
component. |
|
|
|
Device Node |
|
A character device node in the file system used to control and |
|
transfer data in and out of a Kernel driver. |
|
|
|
Digital TV API |
|
**Previously known as DVB API** |
|
|
|
An API designed to control a subset of the :term:`Media Hardware` |
|
that implements digital TV (e. g. DVB, ATSC, ISDB, etc). |
|
|
|
See :ref:`dvbapi`. |
|
|
|
DSP |
|
**Digital Signal Processor** |
|
|
|
A specialized :term:`Microprocessor`, with its architecture |
|
optimized for the operational needs of digital signal processing. |
|
|
|
FPGA |
|
**Field-programmable Gate Array** |
|
|
|
An :term:`IC` circuit designed to be configured by a customer or |
|
a designer after manufacturing. |
|
|
|
See https://en.wikipedia.org/wiki/Field-programmable_gate_array. |
|
|
|
Hardware Component |
|
A subset of the :term:`Media Hardware`. For example an :term:`I²C` or |
|
:term:`SPI` device, or an :term:`IP Block` inside an |
|
:term:`SoC` or :term:`FPGA`. |
|
|
|
Hardware Peripheral |
|
A group of :term:`hardware components <Hardware Component>` that |
|
together make a larger user-facing functional peripheral. For |
|
instance, the :term:`SoC` :term:`ISP` :term:`IP Block` |
|
and the external camera sensors together make a camera hardware |
|
peripheral. |
|
|
|
Also known as :term:`Peripheral`. |
|
|
|
I²C |
|
**Inter-Integrated Circuit** |
|
|
|
A multi-master, multi-slave, packet switched, single-ended, |
|
serial computer bus used to control some hardware components |
|
like sub-device hardware components. |
|
|
|
See http://www.nxp.com/docs/en/user-guide/UM10204.pdf. |
|
|
|
IC |
|
**Integrated circuit** |
|
|
|
A set of electronic circuits on one small flat piece of |
|
semiconductor material, normally silicon. |
|
|
|
Also known as chip. |
|
|
|
IP Block |
|
**Intellectual property core** |
|
|
|
In electronic design a semiconductor intellectual property core, |
|
is a reusable unit of logic, cell, or integrated circuit layout |
|
design that is the intellectual property of one party. |
|
IP Blocks may be licensed to another party or can be owned |
|
and used by a single party alone. |
|
|
|
See https://en.wikipedia.org/wiki/Semiconductor_intellectual_property_core). |
|
|
|
ISP |
|
**Image Signal Processor** |
|
|
|
A specialized processor that implements a set of algorithms for |
|
processing image data. ISPs may implement algorithms for lens |
|
shading correction, demosaicing, scaling and pixel format conversion |
|
as well as produce statistics for the use of the control |
|
algorithms (e.g. automatic exposure, white balance and focus). |
|
|
|
Media API |
|
A set of userspace APIs used to control the media hardware. It is |
|
composed by: |
|
|
|
- :term:`CEC API`; |
|
- :term:`Digital TV API`; |
|
- :term:`MC API`; |
|
- :term:`RC API`; and |
|
- :term:`V4L2 API`. |
|
|
|
See Documentation/userspace-api/media/index.rst. |
|
|
|
MC API |
|
**Media Controller API** |
|
|
|
An API designed to expose and control the relationships between |
|
multimedia devices and sub-devices. |
|
|
|
See :ref:`media_controller`. |
|
|
|
MC-centric |
|
:term:`V4L2 Hardware` device driver that requires :term:`MC API`. |
|
|
|
Such drivers have ``V4L2_CAP_IO_MC`` device_caps field set |
|
(see :ref:`VIDIOC_QUERYCAP`). |
|
|
|
See :ref:`v4l2_hardware_control` for more details. |
|
|
|
Media Hardware |
|
Subset of the hardware that is supported by the Linux Media API. |
|
|
|
This includes audio and video capture and playback hardware, |
|
digital and analog TV, camera sensors, ISPs, remote controllers, |
|
codecs, HDMI Consumer Electronics Control, HDMI capture, etc. |
|
|
|
Microprocessor |
|
Electronic circuitry that carries out the instructions of a |
|
computer program by performing the basic arithmetic, logical, |
|
control and input/output (I/O) operations specified by the |
|
instructions on a single integrated circuit. |
|
|
|
Peripheral |
|
The same as :term:`Hardware Peripheral`. |
|
|
|
RC API |
|
**Remote Controller API** |
|
|
|
An API designed to receive and transmit data from remote |
|
controllers. |
|
|
|
See :ref:`remote_controllers`. |
|
|
|
SMBus |
|
A subset of I²C, which defines a stricter usage of the bus. |
|
|
|
SPI |
|
**Serial Peripheral Interface Bus** |
|
|
|
Synchronous serial communication interface specification used for |
|
short distance communication, primarily in embedded systems. |
|
|
|
SoC |
|
**System on a Chip** |
|
|
|
An integrated circuit that integrates all components of a computer |
|
or other electronic systems. |
|
|
|
V4L2 API |
|
**V4L2 userspace API** |
|
|
|
The userspace API defined in :ref:`v4l2spec`, which is used to |
|
control a V4L2 hardware. |
|
|
|
V4L2 Device Node |
|
A :term:`Device Node` that is associated to a V4L driver. |
|
|
|
The V4L2 device node naming is specified at :ref:`v4l2_device_naming`. |
|
|
|
V4L2 Hardware |
|
Part of the media hardware which is supported by the :term:`V4L2 API`. |
|
|
|
V4L2 Sub-device |
|
V4L2 hardware components that aren't controlled by a |
|
:term:`Bridge Driver`. See :ref:`subdev`. |
|
|
|
Video-node-centric |
|
V4L2 device driver that doesn't require a media controller to be used. |
|
|
|
Such drivers have the ``V4L2_CAP_IO_MC`` device_caps field unset |
|
(see :ref:`VIDIOC_QUERYCAP`). |
|
|
|
V4L2 Sub-device API |
|
Part of the :term:`V4L2 API` which control |
|
:term:`V4L2 sub-devices <V4L2 Sub-device>`, like sensors, |
|
HDMI receivers, scalers, deinterlacers. |
|
|
|
See :ref:`v4l2_hardware_control` for more details.
|
|
|